Power-down circuit - Patent 0895150

(19)

(11)

EP 0 895 150 A3

(12)	EUROPEAN PATENT APPLICATION

(88)	Date of publication A3:
	05.01.2000 Bulletin 2000/01

(43)	Date of publication A2:
	03.02.1999 Bulletin 1999/05

(21)	Application number: 98114300.1

(22)	Date of filing: 30.07.1998

(51)	International Patent Classification (IPC)⁷: G06F 1/24

(84)	Designated Contracting States:
	AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE
	Designated Extension States:
	AL LT LV MK RO SI

(30)

Priority:

01.08.1997 US 905480

(71)	Applicant: PITNEY BOWES INC.
	Stamford, Connecticut 06926-0700 (US)

(72)	Inventors:
	Schoonmaker, Richard A. Wilton, CT 06897 (US) Chen, Wei C. Malden, MA 02148 (US) Degroot-Thomas, Johanna New York, NY 10021 (US) Naclerio, Edward Madison, CT 06434 (US)

(74)	Representative: HOFFMANN - EITLE
	Patent- und Rechtsanwälte Arabellastrasse 4 81925 München 81925 München (DE)

(54)	Power-down circuit

(57) A power-down circuit includes a power-on reset circuit that determines whether the supplied power falls below a prescribed level and, in response, outputs a reset signal for at least a prescribed period of time. A power supply latching circuit is responsive to the power-on reset circuit for switching on a power supply switching circuit to supply power from a power supply when the reset signal is not output. A power-down shutdown circuit, preferably under software control, and a power cutoff circuit, may be coupled to the power supply latching circuit, or alternatively the power-on reset circuit, for shutting down the power supplied from the power supply.

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